arm64: kernel: Remove early fdt remap code

The early FDT remap code is no longer used so let's drop it.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-50-ardb+git@google.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>